Theres a great review of the Onkyo 601 at adioholics.com. I would go with the Onkyo 701 becuse of the pre outs. You will be able to add a amp if you ever need more power in the future plus the processor is THX certifed. I don't think you will be able to find a better deal for under six hundred dollars. I am using the Onkyo SR-700 (100watts x 6) in a very large room and have no complaints.